Horwell, C. J. and Fenoglio, I. and Fubini, B. (2007) 'Iron-induced hydroxyl radical generation from basaltic volcanic ash.', Earth and planetary science letters., 261 (3-4). pp. 662-669.
Iron-induced hydroxyl radical generation from the surface of volcanic ash particles is a possible mechanism of respiratory toxicity in addition to crystalline-silica induced pathogenicity. Here we show that volcanic ash generates hydroxyl radicals, with greater reactivity in iron-rich, silica-poor samples, such as basaltic ash. Basaltic particles expose at the surface high levels of poorly-coordinated iron ions in both Fe(II) and Fe(III) oxidation states which are likely to be the cause of such reactivity. Hitherto, basaltic ash has been disregarded as a hazard due to the lack of crystalline silica particulate but future hazard assessment should consider its toxic potential.
|Keywords:||Volcanic ash, Basalt, Iron, Respiratory health hazard, Free radical generation, Fenton activity.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||http://dx.doi.org/10.1016/j.epsl.2007.07.032|
|Record Created:||23 Feb 2009|
|Last Modified:||05 Apr 2010 16:56|
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